电路元件参数对串联谐振电路选择性影响研究

Research on effect of circuit component parameters on selectivity of series resonance circuit

针对串联谐振电路中,当改变电容C来改变电路的品质因数Q时电流谐振曲线的尖锐程度不发生改变的问题,通过对串联谐振电路电流谐振曲线分析,研究在相同偏谐程度下的各谐振电路对失谐信号的抑制能力,提出不能用品质因数Q值的大小来衡量任意串联谐振电路选择性的好坏,并明确电路元件参数对串联谐振电路选择性的具体影响。最后通过Multisim仿真实验验证了该结论的正确性。

Aiming at the problem that the sharp degree of current resonance curve does not change in the series resonance circuit when the change of capacitor C brings to the change of the quality factor Qof the circuit,and through the analysis on the current resonance curve of the series resonance circuit,the research is carried out on the suppression ability of each resonance circuit in the same bias degree for detuning signal suppressing.It is proposed that the size of the quality factor Qcan’t be used to measure whether the selectivity of the series resonance circuit is good or not,and the specific effect of the circuit component parameters on the selectivity of the series resonance circuit can be defined.In the end,the correctness of the conclusion is verified by the Multisim simulation experiment.